Wavelet bicoherence: A new turbulence analysis tool

Journal Article · Tue Aug 01 00:00:00 EDT 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871199· OSTI ID:76481

van Milligen, B P; Sanchez, E; Estrada, T; Hidalgo, C; Branas, B ^[1]; Carreras, B ^[2]; Garcia, L ^[3]

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1. Asociacion EURATOM-CIEMAT, Madrid (Spain)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
3. Universidad Carlos III, Madrid (Spain)

A recently introduced tool for the analysis of turbulence, wavelet bicoherence [van Milligen, Hidalgo, and Sanchez, Phys. Rev. Lett. {bold 16}, 395 (1995)], is investigated. It is capable of detecting phase coupling---nonlinear interactions of the lowest (quadratic) order---with time resolution. To demonstrate its potential, it is applied to numerical models of chaos and turbulence and to real measurements. It detected the coupling interaction between two coupled van der Pol oscillators. When applied to a model of drift wave turbulence relevant to plasma physics, it detected a highly localized coherent structure. Analyzing reflectometry measurements made in fusion plasmas, it detected temporal intermittency and a strong increase in nonlinear phase coupling coinciding with the L/H (low-to-high confinement mode) transition. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• OSTI ID: 76481
• Journal Information: Physics of Plasmas, Vol. 2, Issue 8; Other Information: PBD: Aug 1995
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
TURBULENCE
INTEGRAL TRANSFORMATIONS
DRIFT INSTABILITY
PLASMA INSTABILITY